OSDOCS#14939: Adding known issue for GitLab provider

Author: bergerhoffer

release_notes/ocp-4-20-release-notes.adoc

@@ -1781,9 +1781,7 @@ In the following tables, features are marked with the following statuses:
 [id="ocp-release-known-issues_{context}"]
 == Known issues
 
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+* When using GitLab as the external OIDC identity provider for direct authentication, clicking *Log out* from the {product-title} web console does not log you out of the console. (link:https://issues.redhat.com/browse/OCPBUGS-61649[OCPBUGS-61649])
 
 [id="ocp-telco-core-release-known-issues_{context}"]